The basin tectonic model: it is intermont basin during late Jurassic to early Cretaceous, developed into faulted-lacustrine basin in Eogene, and evolved into depression in Neogene and Quaternary.

“盆地”构造式为：从晚侏罗世到白垩纪末的山间“盆地”开始、展到纪断陷湖盆的、再演化为晚纪及四纪地陷阶段。